from System.Collections.Generic import *
from System.Drawing import *
from Rhino import *
from Rhino.Commands import *
from Rhino.Display import *
from Rhino.Geometry import *
from Rhino.Input import *
from Rhino.DocObjects import *
from scriptcontext import doc

m_line_objects = []

def RunCommand():
  # make lines thick so draw order can be easily seen
  wfdm = [dm for dm in DisplayModeDescription.GetDisplayModes() if dm.EnglishName == "Wireframe"][0]
  original_thikcness = wfdm.DisplayAttributes.CurveThickness
  wfdm.DisplayAttributes.CurveThickness = 10
  DisplayModeDescription.UpdateDisplayMode(wfdm)

  AddLine(Point3d.Origin, Point3d(10,10,0), Color.Red, doc)
  AddLine(Point3d(10,0,0), Point3d(0,10,0), Color.Blue, doc)
  AddLine(Point3d(8,0,0), Point3d(8,10,0), Color.Green, doc)
  AddLine(Point3d(0,3,0), Point3d(10,3,0), Color.Yellow, doc)
  doc.Views.Redraw()
  Pause("draw order: 1st line drawn in front, last line drawn in the back.  Any key to continue ...")

  #all objects have a DisplayOrder of 0 by default so changing it to 1 moves it to the front.  Here we move the 2nd line (blue) to the front
  m_line_objects[1].Attributes.DisplayOrder = 1
  m_line_objects[1].CommitChanges()
  doc.Views.Redraw()
  Pause("Second (blue) line now in front.  Any key to continue ...")

  for i in range(0, m_line_objects.Count - 1):
    m_line_objects[i].Attributes.DisplayOrder = i
    m_line_objects[i].CommitChanges()

  doc.Views.Redraw()
  Pause("Reverse order of original lines, i.e., Yellow 1st and Red last.  Any key to continue ...")

  # restore original line thickness
  wfdm.DisplayAttributes.CurveThickness = original_thikcness
  DisplayModeDescription.UpdateDisplayMode(wfdm)

  doc.Views.Redraw()
  return Result.Success

def Pause(msg):
  rc, obj_ref = RhinoGet.GetOneObject(msg, True, ObjectType.AnyObject)

def AddLine(from_pt, to_pt, color, doc):
  guid = doc.Objects.AddLine(from_pt, to_pt)
  obj = doc.Objects.Find(guid)
  m_line_objects.Add(obj)
  obj.Attributes.ObjectColor = color
  obj.Attributes.ColorSource = ObjectColorSource.ColorFromObject
  obj.CommitChanges()

if __name__ == "__main__":
  RunCommand()